KR101661596B1 - Multi sheet for antenna - Google Patents

Abstract

A composite sheet for an antenna and a manufacturing method thereof are disclosed. The present invention includes a first sheet for shielding an antenna in a high frequency band and a second sheet stacked to form a step with the first sheet, wherein the second sheet has a cross section formed by forming a coating layer on a stepped section It is possible to permanently protect the antenna, thereby extending the lifetime of the antenna and improving the reliability thereof.

Description

MULTI SHEET FOR ANTENNA "

The present invention relates to a composite sheet for an antenna, and more particularly, to a composite sheet for an antenna in which a coating layer is formed on a stepped section of a composite sheet composed of one or more shielding sheets for shielding a magnetic field and heat generated in the portable terminal, And a manufacturing method thereof.

(NFC), a wireless charger, and an interactive pen tablet.

NFC is one of the RFID tags, which is a non-contact type short-range wireless communication module using 13.56Mz frequency band. It is a technology to transmit data between terminals at a distance of 10cm. NFC is widely used not only for mobile payments, but also for transferring travel information, transportation, and access control locks for goods information and visitors in supermarkets and general shops, as well as for file transfer.

In addition, recently announced by Google, 'Android Beam' included in the smart phone is a near-field wireless communication (NFC) -based short distance information transmission and reception function that not only allows mobile payment but also photo, business card, file, map, To other phones.

2. Description of the Related Art Wireless environments of RFID (Radio Frequency Identification) are widely used in portable terminals. For example, an NFC chip for realizing Near Field Communication (NFC) is installed in a portable terminal, When a non-contact type smart card such as a USIM (Universal Subscriber Identity Module) card is attached to access an external RF reader, the information of the USIM card of the portable terminal is read by the RF reader by the short distance wireless communication, (For example, an electronic money function) such as an electronic money function is realized.

At this time, information exchange between the NFC chip and the RF reader is performed by driving the USIM card by the electromotive force at 13.56 MHz between the primary coil (antenna) installed in the RF reader and the coil of the NFC chip installed in the portable terminal For example.

In addition, the NFC chip installed in the portable terminal device is also developed as an RFID reader so as to be able to read information recorded in an external RFID tag or the like. When an NFC chip operates as an RF reader, an antenna (coil) connected to the NFC chip acts as a primary coil to transmit power, and an induced electromotive force is generated in a coil (antenna) To be realized.

That is, in order to apply the RFID system (NFC) to the portable terminal, a helical coil type loop antenna capable of generating an induced electromotive force is required, and the NFC antenna is mainly installed in the battery cover.

In this case, the induced electromotive force induced in the helical coil-shaped loop antenna is determined by Faraday's law and Lenz's law. Therefore, in order to obtain a high voltage signal, a secondary coil (antenna coil) The greater the amount of magnetic flux, the better. The amount of magnetic flux increases as the amount of soft magnetic material contained in the secondary coil increases and as the permeability of the material increases.

In addition, a magnetic field is generated in an antenna coil provided in the portable terminal when performing a short-range wireless communication (NFC) function with an adjacent terminal.

Therefore, in a portable terminal device having such an additional function, it is possible to prevent heat due to eddy current from being applied to a component (particularly, battery) of the portable terminal device due to the magnetic field and to maximize the performance of the additional function A shielding sheet is essentially used.

As such a shielding sheet, a magnetic material such as a polymer sheet including amorphous, ferrite and magnetic powder is generally used. The magnetic field focusing effect for enhancing the magnetic shielding and the performance of the additional function is preferably in the order of the amorphous sheets 122 and 122 'having high magnetic permeability, the ferrite and the polymer sheet including the magnetic powder.

Therefore, conventionally, a magnetic sheet made of a magnetic sheet having a composition selected from the group consisting of Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co- An absorber for an RFID antenna, an RFID antenna including the same, and a wireless identification device.

Meanwhile, an antenna for a magnetic security transmission (MST) (hereinafter referred to as a "payment antenna") as a payment means using a wireless charging antenna for wireless charging and a portable terminal together with an NFC antenna is integrally formed in the portable terminal, Of the battery pack.

In a typical structure of an antenna substrate in which two or more different types of antennas are integrated, an antenna for wireless charging for wireless charging is located at the center of an antenna substrate of an S company, an MST antenna coil is placed on the antenna, Three types of antennas in which antenna coils exist are integrally formed or two integral types in which only a wireless recharging antenna and an NFC antenna exist without an MST antenna if necessary.

In order to prevent heat generation due to eddy current and to concentrate a magnetic field to improve respective antenna characteristics and transmission efficiency, a terminal equipped with an integrated structure in which two or more kinds of antennas for generating such a magnetic field are combined A suitable magnetic shielding sheet should be used.

Therefore, in the conventional composite sheet, the amorphous sheet has a higher permeability than the ferrite sheet and is mainly used to shield the magnetic field of the wireless charging antenna. The polymer sheet including the ferrite sheet or the magnetic powder has a low permeability and low loss rate And is used to shield the magnetic field of the short-range wireless antenna.

If an amorphous sheet having a high permeability and a high loss ratio is used for shielding a short-range wireless antenna, the performance of the short-range wireless antenna can be largely deteriorated because a proper Q value can not be formed.

Therefore, in the two or more integral type antenna structure including the wireless rechargeable antenna, the polymer sheet including the ferrite sheet or the magnetic powder is placed in consideration of the characteristics of the antenna for the short-range wireless communication, A step is formed by the area difference of each sheet in the form of a composite sheet in which Perth sheets are laminated.

Therefore, conventionally, the stepped section of the amorphous sheet is shielded as a double-sided tape to prevent contact of substances such as air or saline which may cause oxidation.

However, since the conventional composite sheet shields a stepped section as a double-sided tape, air may remain in the process of adhering the double-sided tape. That is, in the conventional stepped section, air is left between the double-sided tape and the end face, and an air gap is generated where the double-sided tape causes mobility.

Therefore, in the conventional composite sheet, the air remaining in the air gap (AIR GAP) can oxidize the cross section of the amorphous sheet, thereby deteriorating the antenna performance.

Further, since the conventional composite sheet is a double-sided tape which is shielded by a step section, the oxidation can be prevented in a short period of time. However, when a certain period of time is elapsed, the adhesive force is weakened and saltwater infiltration may occur. That is, the conventional composite sheet has a problem in that it is not possible to permanently protect the brine and other substances causing oxidation.

Korean Registered Patent No. 10-1185681 (September 18, 2012) Korean Patent Laid-Open Publication No. 10-2014-0103063 (Aug. 25, 2014) Korean Patent Registration No. 10-1513052 (Apr. 13, 2013) Korean Patent Laid-Open Publication No. 10-2014-0109336 (2014.09.15)

A first object of the present invention is to provide a composite sheet for an antenna capable of permanently protecting a composite sheet in which one or more magnetic sheets are laminated so as to shield a substrate on which at least one antenna pattern is formed, .

A second object of the present invention is to provide a composite sheet for an antenna capable of preventing an air gap in a composite sheet laminated on a substrate on which at least one antenna pattern is formed, and a manufacturing method thereof.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an antenna device and a method for manufacturing the same. And one or more amorphous sheets (AMORPHOUS SHEET) which are sequentially laminated.

Further, the composite sheet of the present invention further includes a third sheet that shields heat from the upper surface of the second sheet.

A method for manufacturing a composite sheet for an antenna according to the present invention includes a lamination step of laminating one or more magnetic sheets, a punching step of punching the laminated sheet to have a predetermined area, and a step of forming a coating layer And a filling step of filling the outer surface of the coating layer with a filler to expand the outer surface of the coating layer by a predetermined area.

Accordingly, the present invention provides a UV coating layer formed on the cross section of the composite sheet to permanently protect the punched cross section, thereby extending the lifetime of the antenna and improving the reliability thereof.

Further, the present invention has the effect of preventing the air gap (AIR GAP) by forming the UV coating layer on the stepped section in the composite sheet in which one or more magnetic sheets are laminated.

1 is a plan view showing a composite sheet for an antenna according to the present invention.
2 is a plan view of a substrate on which a composite sheet for an antenna according to the present invention is laminated.
3 is a flowchart showing a method of manufacturing a composite sheet for an antenna according to the present invention.
4 is a flowchart showing a second sheet producing step in the composite sheet manufacturing method for an antenna according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments It is not limited to examples and examples.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Throughout this specification and claims, when a section is referred to as " including " an element, it is understood that it may include other elements, aside from other elements, .

Hereinafter, preferred embodiments of a composite sheet for an antenna and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view illustrating a composite sheet for an antenna according to the present invention, and FIG. 2 is a cross-sectional view illustrating a substrate 200 on which a composite sheet for an antenna according to the present invention is stacked.

Referring to FIGS. 1 and 2, a composite sheet for an antenna according to the present invention includes first to third sheets sequentially stacked on a substrate 200 on which at least one antenna pattern is formed, (140), and a filler (150) that protects the outer surface of the coating layer (140).

The substrate 200 includes a radiofrequency antenna pattern 220 for forming a helical loop on the top surface of the substrate 200, an antenna pattern 230 for deposition for forming a helical loop outside the radiofrequency antenna pattern 220, A short distance wireless antenna pattern 210 forming a helical loop at the outermost side and a short distance wireless antenna pattern 220 connected to the start and end ends of the wireless charging antenna pattern 220 and the short distance wireless antenna pattern 210, A terminal portion 240 connected to be energized is formed.

The composite sheet 100 is stacked on the upper surface of the substrate 200 to perform magnetic shielding and heat dissipation. A first sheet 110 stacked on the upper surface of the substrate 200; a second sheet 120 stacked on the upper surface of the first sheet 110; And a third sheet 130 stacked thereon.

The first sheet 110 is made of, for example, a polymer sheet (hereinafter collectively referred to as a ferrite sheet 112) to which a magnetic field shielding ferrite or a magnetic powder is applied, 1 adhesive layer 111 and first protective means 113 bonded to the upper surface of the ferrite sheet 112. [

The adhesive layer 111 of the first sheet 110 bonds the ferrite sheet 112 to the substrate 200. Here, the adhesive layer 111 is formed by a double-sided tape composed of a release paper on both sides of which an adhesive liquid is applied and which is provided so as not to expose the adhesive liquid to air.

The first protection means 113 protects the appearance of the ferrite sheet 112 as a transparent film adhered on the upper surface of the ferrite sheet 112.

The second sheet 120 is an amorphous sheet 122 or 122 '(AMORPHOUS SHEE) which has a magnetic permeability higher than that of the ferrite sheet 112 and shields the magnetic field of the antenna in a lower frequency band, The charging antenna pattern 220 is prevented from being damaged due to an eddy current generated when the wireless power is charged and the influence of the magnetic field on the main body and the battery of the portable terminal is blocked.

Here, the second sheet 120 includes at least one amorphous sheet 122, 122 'laminated by an adhesive layer 121, 121' and a second protective layer 122, 122 'for protecting the appearance of the amorphous sheet 122, 122' (123).

For example, the second sheet 120 may include a first amorphous sheet 122 bonded to the upper surface of the first protective means 113 of the first sheet 110 by the adhesive layers 121 and 121 ' And a second amorphous sheet 122 'bonded by an adhesive layer 121' on the upper surface of the first amorphous sheet 122. The laminated structure of the amorphous sheets 122 and 122 'can enhance the shielding of the magnetic field due to the power for wireless charging received at the antenna pattern 220 for wireless charging.

The second protection means 123 is adhered to the upper surface of the second amorphous sheet 122 'with a film and / or a resin plate for protecting the outer surface of the second sheet 120.

Here, the second sheet 120 is an antenna pattern for a short-distance radio using a high frequency band (for example, 13.56 MHz) when laminated with the same area as the first and third sheets 110 and 130 210).

Therefore, the second sheet 120 is manufactured to have a smaller area than the first sheet 110 in order to prevent interference with the antenna pattern 210 for the short-distance radio. Therefore, the second sheet 120 is laminated with a step between the first sheet 110 and the third sheet 130. [

The third sheet 130 is stacked on the upper surface of the second sheet 120, for example, to suppress and / or shield heat generation. To this end, the third sheet 130 comprises a graphite sheet 132 coated with a graphite powder and a third protective means 133 for preventing scattering of the graphite powder.

Here, the graphite sheet 132 (graphite sheet) is coated with graphite powder, and the graphite powder may be scattered or contacted with the object or the human body during operation or use of the operator.

Therefore, the third protection means 133 is adhered and shielded so as to surround the entire structure so that the graphite sheet 132 is not exposed to the air. That is, the third protection means 133 is bonded so as to shield the upper surface and the end surface of the graphite sheet 132 except the lower surface thereof.

Here, the first to third protective means 113, 123 and 133 can be selected as needed among a colorless transparent film or a colored film.

The coating layer 140 is formed by UV-induced thermal deformation at the cut end face of the stepped second sheet 120. Accordingly, since the coating layer 140 is formed by thermal deformation by UV, the conventional air gap (AIR GAP) is not generated.

The filling material 150 covers the steps of the composite sheet 100 on which the coating layer 140 is formed so that the cross sections of the first to third sheets 110 to 130 are aligned and protects the appearance of the coating layer 140. For this, the filler 150 may be a double-sided tape, a liquid or a gel-like adhesive.

Hereinafter, a method of manufacturing a composite sheet for an antenna according to the present invention will be described with reference to the accompanying flowcharts.

3 is a flowchart showing a method of manufacturing a composite sheet for an antenna according to the present invention.

Referring to FIG. 3, a method for manufacturing a composite sheet for an antenna according to the present invention includes a first sheet 110 manufacturing step S100 for fabricating a first sheet 110 in consideration of the shape of a substrate 200, A second sheet 120 manufacturing step S200 for fabricating the second sheet 120 and a third sheet manufacturing step S300 for manufacturing the third sheet 130. [

The first sheet 110 manufacturing step S100 is a step of manufacturing in consideration of the area so as to be shielded to the upper side of the antenna pattern 210 for short range wireless communication formed on the substrate 200. [ The operator attaches the first protective means 113 to the upper surface of the ferrite sheet 112.

Then, the operator attaches the double-faced tape from which the releasing paper is removed from the lower surface of the ferrite sheet 112, and keeps the releasing paper on the opposite surface so that the adhesive layer 111 is not exposed. The release paper is removed immediately before the ferrite sheet 112 is adhered to the substrate 200 to expose the adhesive layer 111.

Step S200 of fabricating the second sheet 120 may be performed by stacking one or more of the amorphous sheets 122 and 122 'using a double-sided tape or other bonding means and bonding the second protective means 123 to the upper surface thereof So as to have an area. A specific procedure will be described later with reference to FIG.

The adhesive layer 131 is formed on the lower surface of the graphite sheet 132 using a double-sided tape and the third protection means (not shown) is formed in the remaining region except for the lower surface of the graphite sheet 132 133 are adhered to each other to manufacture the third sheet 130. The third protective means 133 is applied and / or bonded to the remaining area except the lower surface of the graphite sheet 132 so that the graphite powder applied to the graphite sheet 132 is not scattered to the periphery so that the graphite sheet 132 is shielded .

In the laminating step S400, the first sheet 110, the second sheet 120 and the third sheet 130 are sequentially laminated on the upper surface of the substrate 200 on which the one or more antenna patterns 210 to 230 are formed And one or more antennas are integrally manufactured.

Here, the short-range wireless antenna pattern 210 using the high-frequency band is formed on the outermost side, and the wireless-charging antenna pattern 220 using the low-frequency band is formed as a spiral loop in the central portion of the substrate.

Accordingly, the first sheet 110 has a lower permeability than the second sheet 120 according to the arrangement of the antenna patterns 210 to 230, so that the first sheet 110 has an area equal to or larger than that of the substrate 200 do.

The second sheet 120 is stacked with less area than the first sheet 110 and the third sheet 130 in order to prevent interference with the antenna pattern 210 for short-distance radio.

Therefore, the composite sheet 100 is formed with a step in the cross section of the second sheet 120 positioned between the first sheet 110 and the third sheet 130. Here, the cross section of the stepped second sheet 120 may cause oxidation when it is exposed to air or foreign matter such as salt water is contacted. Accordingly, the present invention applies the coating layer 140 and the filler 150 by UV as described above.

Such a process will be described in the manufacturing step S200 of the second sheet 120 of FIG. 4, but the present invention is not limited to this, but may be carried out also in the above-described lamination step.

4 is a flowchart showing a second sheet producing step in the method for producing a composite sheet for an antenna according to the present invention.

Referring to FIG. 4, the second sheet manufacturing step S200 includes a stacking step S210 of stacking at least one amorphous sheet 122, 122 'and a second protective means 123, A coating step S230 for forming a coating layer 140 on the cut end face and a filling step S240 for filling the filling material 150 after the coating step S230, ).

The lamination step S210 is a step of sequentially laminating at least one amorphous sheet 122, 122 'and the second protection means 123. [ The operator forms an adhesive layer 121 'on the upper surfaces of the first amorphous sheets 122 and 122' using an adhesive liquid or a double-sided tape and adheres the second amorphous sheet 122 '. The operator also attaches the second protection means 123 to the upper surface of the second amorphous sheet 122 '.

Here, the adhesive layers 121 and 121 'may be formed as a double-sided tape and a liquid or gel-like adhesive. Particularly, the lower surface of the first amorphous sheet 122 is in a state in which the release paper is maintained Double-sided tape is bonded. Such a release sheet is removed before it is adhered to the upper surface of the first protective means 113 of the first sheet 110 in the substrate stacking step S400.

The punching step S220 is a step of cutting the second sheet 120 in accordance with the area set in consideration of the position of the antenna pattern 210 for short range wireless communication formed on the board 200. [ Here, the at least one amorphous sheet 122, 122 'and the second protection means 123 are cut by the punching equipment.

The coating step S230 is a step of forming the coating layer 140 by irradiating UV onto the end face of the second sheet 120 punched in the punching step S220. Here, the end face of the second sheet 120 is not exposed to the air by the coating layer 140, so that Fe, which is a main component of the amorphous sheets 122 and 122 ', is prevented from contacting with foreign matter such as air or salt water.

The filling step S240 is a step of filling the filler 150 on the outer surface of the coating layer 140 after the coating step S230. Here, since the second sheet 120 has a smaller area than the first sheet 110 and the third sheet 130 as described above, a step difference occurs in the composite sheet stacked in the substrate stacking step S400 described above.

Therefore, the filling material 150 may fill the stepped portion generated due to the difference in area between the second sheet 120 and the first and second sheets 110 and 130, 1 sheet 110 and the third sheet 130. In the present embodiment,

As the filler 150 is filled and hardened on the outer surface of the coating layer 140, the outer appearance of the cross section cut together with the coating layer 140 can be doubly protected.

The second sheet 120 manufactured through the above process is laminated on the first sheet 110 in the stacking step of the substrate 200 described above. At this time, the operator removes the release sheet of the double-faced tape adhered to the lower surface of the first amorphous sheet 122 and then exposes the adhesive layer 121 to adhere the second sheet 120 to the upper surface of the first protective means 113.

Similarly, the operator removes the release paper of the double-sided tape adhered to the lower surface of the graphite sheet 132, and bonds the adhesive layer 131 to the upper surface of the second sheet 120 after exposing the adhesive layer 131.

That is, according to the present invention, an air gap (AIR GAP) is not generated by UV coating a cross section of the second sheet 120 laminated to have a step difference.

In addition, according to the present invention, the filler 150 is filled on the outer surface of the coating layer 140 to remove the step, thereby doubly protecting the cut end face of the second sheet 120, The operation of stacking the composite sheet on the substrate 200 can be more conveniently performed.

100: composite sheet 110: first sheet
112: ferrite sheet 111, 121, 121 ', 131: adhesive layer
113: first protection means 120: second sheet
122, 122 ': Amorphous sheet 123: Second protective means
130: third sheet 132: graphite sheet
133: third protection means 140: coating layer
150: filler material 200: substrate
210: Short-range wireless antenna pattern 220: Wireless charging antenna pattern
230: Distribution antenna pattern 240: Terminal portion

Claims (4)

A first sheet shielding an antenna in a high frequency band;
A second sheet for shielding an antenna in a low frequency band by sequentially stacking at least one amorphous sheet having a narrow area to form a step with the first sheet;
A third sheet that shields heat from the upper surface of the second sheet;
A UV coating layer formed on an end surface of the second sheet; And
And a filler filling the outer surface of the coating layer.
The sheet according to claim 1, wherein the third sheet
GRAPHITE SHEET coated with GRAPHITE powder; And
And protective means for shielding an outer surface of the graphite sheet.
Fabricating a first sheet that shields a magnetic field at an antenna in a high frequency band;
A second sheet producing step of sequentially laminating at least one amorphous sheet (AMORPHOUS SHEET) to produce a second sheet;
A third sheet producing step of producing a third sheet shielding the heat generation; And
And the second sheet is laminated on the substrate on which the at least one antenna pattern is formed so as to form a step between the first sheet and the third sheet,
The second sheet producing step
A lamination step of laminating at least one amorphous sheet;
A punching step of punching the first sheet so as to have a narrow area as compared with the first sheet;
Forming a coating layer by irradiating ultraviolet rays onto a cross section formed in the punching step; And
And filling the outer surface of the coating layer with a filling material to expand the coating layer by a predetermined area.
The method according to claim 3, wherein the third sheet producing step
Wherein a protective means is laminated so as to surround the outer surface of a graphite sheet coated with a graphite powder.

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